public class HomeWork09 {
	public static void main(String[] args){
		int sum = 0;
		for(int i = 1; i <= 100; i++){
			for(int j = 1; j <= i; j++){
				sum += j;
			}
		}
		System.out.println("1 + (1 + 2) + (1 + 2 + 3) + ... + (1 + 2 + 3 + 4 +...+ 100) = " + sum);
	}
}